SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0b2e40be570ad70d4c41799b30e911adc764c0f3413f95ef37cc40d28436394a' 
  AND token = 'lHYVhnVdOqpPKdQxl0O/tnggb7Zr++A+JMq39t6zHRw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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