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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '02723b1a681be23aa96903d0d91b6d7960cd945a2cfba501c11392a05f889d99' 
  AND token = 'qc+K3eYc77pi8UBx5gTE6zPr5zz+AhahEHa/RDx1nqU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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