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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3dfbf27bb66ed48f41a0d46e6620c8bba667c2706026f09ecc14df43f25d0696' 
  AND token = '+ZcW0W9imUzaW+PiyakZYQFPCtvwQg3rw6kOaXb1mOo=' 
  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"
    }
  }
}