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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd9a04184c7744ec60cccae1b5eb3329062c2707a9563a05f6aed3de4e03bb40a' 
  AND token = '+hUNsNbMt8XKmBMBSbQgy+WLquR9cLlskpAmvZ0zB8g=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00010

JSON explain

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