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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a76b58ce7454af8cf8fa2308ec61d9c3920cfe4cd9149c7a2a82148192020a2f' 
  AND token = 'cG/3J17wIh6wimuH0C3GlEWoJL6Q55heoAzlP31mVoA=' 
  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"
    }
  }
}