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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f35fd6bb22375d7e98be05639992a8b4f6d5e0c304a034138cb41d5553c9baf6' 
  AND token = '1C1AXb9X0aVmgr+py0tEjHz3uZ+TXJDqtMaz5xeshHg=' 
  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"
    }
  }
}