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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bdc781101763e2d56ffecb341c83220361b55b82d279b46189e82c5dd5b21cf4' 
  AND token = 'Q6Ded/sDRnQFdtnh9OIxs8fX9zMz/QNr9kJzKxPmVlE=' 
  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"
    }
  }
}