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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e9b714d01145d954c518c546223f1d5e90f219023c5bc159cd71da4e415097d6' 
  AND token = 'lFqSEZCCRBFnRQ+GWaUojAmIN8Q7PaJ5hlUz+J3Oa3k=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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