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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9b997a21e2e69ccdfd9c8462a431609a66ab9f804cad9df15dba707b759c2c71' 
  AND token = 'Lp0LuQ0gicDWTc8EG88/F0dkmxjsUvw4PZEcsvkXPRI=' 
  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"
    }
  }
}