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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4ea41a6ff9b156ac29d1268026f8d1b80a41210d2f3bfb56b68b4577e75215d7' 
  AND token = 'ZAzrdBBAHLfj/DDSROX2fEBNrsHPfao/CMaw5xIEOgQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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