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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8eb09f76abfa395e4f740eab44990fad6badcd5e2bd08f9485c3cde624dc05e0' 
  AND token = 'cx5sewFC8Aurrra5fMandQ1p4NBrCLYNUFuMV2bdK5g=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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