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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fc0600b941388700ec06eb110d1560992c08d02f0702b683c5d90d2e544477c2' 
  AND token = '6IhF8GoXgO6syd8FDONM4B7+66G0sR7XGOLnDRtaH9U=' 
  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"
    }
  }
}