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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '82ac02de8b2f9e743ce5baeb0073cc66530ae2262bd74ee74017319541e23828' 
  AND token = 'iyOxcGW3V/JT0SJ1FhT3vVy07whHSIrIfCRSRfOTLjM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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