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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '617a83c955080068725fd5f6a1209596ac4fc1297277bc58bd0219008ee017c2' 
  AND token = 'ftkCq6+OdPoXZBTGLxaT2INi1Qt+J02AR3HVHdlK4GE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00013

JSON explain

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