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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9dea81e700e44dc124972a23c03c83a1c549e12f807908a509878dab8f5ce13c' 
  AND token = 'WaJ/a+Fo7bA4FldYohLBN9dN/SOq1m3iEBg6U99XFmk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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