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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0f07ef6d6cfcfe0ba075b2339f048579056b2c702c78983fd3f498e8330a9e56' 
  AND token = 'Y5fyvhrAEmWPeKDnDhARoc4X3GjLeFzJs/FlLsjqfJU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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