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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7a60dc054f0e313d693ced522bf607c2b8242078dcb22c719acdf89e92104eb3' 
  AND token = 'bf8q/p1vCj3NRc/02PyFJTQoVpyT347h9tsN+z1d6so=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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