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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c85d9d6904a68c2c29955c60cfab816b9bfed370418299979614ef554c5fa717' 
  AND token = 'mAwabn2nBLnOBcXS40yumN5FpSCDNUhhENEVpVDZE0g=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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