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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '712a5025f184bdad8b7e85c0ff322d4f31031d0de9a4fa1c184db4e26e24fd19' 
  AND token = 'wrwVnp2EGBSBZQMQD/DJhFMESn+Q1sIu7zcKEONBs8c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

{
  "query_block": {
    "select_id": 1,
    "table": {
      "message": "Impossible WHERE noticed after reading const tables"
    }
  }
}