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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '600a87759e139e11d64bb34d7e3369521431a1aff654786db77fdb0770cad323' 
  AND token = 'oSBZo2Uvv2r+wZTnvaj7tASnkw8+zspnG0OwU5kc5xg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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