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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '50bc745e88eea3cd78910d5499f576e2fb76f6f57b58ff8d610cac819cb9166e' 
  AND token = '4veeRS/qVQSAW75yAUOpYTfgYeLu997NgCTjWWjmWX4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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