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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e33d10456b70e175a63a6770573b9852fec09f7c0c20504c200a8efb50a9170d' 
  AND token = 'PK7W2GupJDPyEkZgE1YDHqPv6IzOXLBWeLcUCyPzhdk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00047

JSON explain

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