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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5663138ec9c7d001bc59500d257c2bbed653607532ec7b2519257bcfdc50b03a' 
  AND token = 'C1af0nFSfrsoW67PmsxFpVIWYX7pPjHmjETIAZ878xw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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