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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c517cd06aa60b555b74b228a086dc9238e9d894c0c79c93865aa4df84dcc1060' 
  AND token = 'apx7G1LQ7N+6i9DM/s3uZF7oAC6ncl8WdyFbOGkZ1SU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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