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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '995301fdd79c0e734dab3986f8579c7ef9117d080e52279a80fc6c214b6cf3ef' 
  AND token = '5GOecMFD8dgVQAHi3jy63iRZxF9RvhZDubo0n3vHFEA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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