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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '89b1d4592d20b5ee2bb28e48de26ffbfd3c3cda501f20ae1ef33518baf39d50a' 
  AND token = 'KqrRwciw/wdvNvkoyp2Hr2UB0pg4f8+eZMx1wfithiQ=' 
  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"
    }
  }
}