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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'eadfbc36515717d299fa7f60b27c8e38987c7676b4d91ad5d7a140fa1b029400' 
  AND token = 'djg3zoRoN1PLDjeG2hGiuKXuDK18zsTSx7uPw+iKwzg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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