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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3614f290226a92b038c86359e376977e5eeff2cb1884e3cb9d3cafc44e7f7166' 
  AND token = 'Vx+RAUeC741vD74qoajI2HzldfMQUzKhpWxHq6+IqAc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00047

JSON explain

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