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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c307da7bbb1d57680030f88ec1972537b1e6cf26338bd255c0e03cd6d8a5e9c5' 
  AND token = 'xJw956DiW7qWh2HlyBETCWAe6ms4+ksnKlxbzz6oCZU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00013

JSON explain

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