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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c574332330d64609a7f12d70b857fc7886e50dbcf80df95a77df0da41629489c' 
  AND token = 'uRUmHaIgjmMm1Rgk0O5KuhWVqC7IO4b3Ck+IFf+fhe0=' 
  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"
    }
  }
}