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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f73bb1f88b579e29c5da6ceec88d60c8077356fab83ff53716002466bf535ed0' 
  AND token = 'em6YSIXlJuDBSzkNY3jGDqLK3X098hVyRN6aMDE/rpY=' 
  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"
    }
  }
}