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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '52c87ab0289a332f23d33fec29652deb2efd4f1153f535f0651ba2ad9e16c31f' 
  AND token = 'N7oRot6dNdeCuy1lnUD4r2HePeOEjggqMe6BmFQ2OCI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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