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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f1d40b92f60520a8a5d140b1c6af5846f0e4d029344448d065233df258ed53a8' 
  AND token = 'mkPkW/iKydg4p9NnA7mdQRCgJ2bO7kAd0ZG1QFEK5zw=' 
  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"
    }
  }
}