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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ee3b57f0a24a630c388f0d1d77336cbf57593bbf8b9e5e22d1d975918343a2fe' 
  AND token = 'jqx0URd7ic80OyUUWsFQcf3VQOwVt+khtH5oKKhVrdM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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