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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2d69fe3907d6c0d043f4298e976d95f07e1d3fa96ba28eda9e7a70ea79cae7a4' 
  AND token = '8qGxD88NCYoblqelhAic+USZw+XwIDKRJfLurH7LADM=' 
  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"
    }
  }
}