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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b084d814075ad1d7214891a96c6f561b3db7d4f54dd99c8f3ab6ab277f0664c6' 
  AND token = '44DeMeJ4ie+PoyJ7Pp2u7K2Dn6xAglAb8z0Lle2TZbg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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