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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4d69f32006ad0f96fa2beb880092f73b46e303ce2d6f0059e9d31f698cea0118' 
  AND token = 'S1+HqQ+87AyjYwLP7oZ6nFoUZEGeyvjdQQLWVh8YlfA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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