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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '68b5b904a286e38360e84f0adcef715480b0e5584e7e2d01658fa555fd4af936' 
  AND token = 'APewsLj5FDVGtKKotWXBE04ekYhq3izD+Q92o9JfZH4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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