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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd1dae99ba64ecbe2a68c8f397f462d5957c8b4b7b127b23fa2fe64d5896861d8' 
  AND token = 'KTk5GtnBztHXE+uLsZHCPOSuf22vWHa2mzFN1PNMZCI=' 
  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"
    }
  }
}