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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '97046682b1f156879958d4a3950935e370f63e1789f39b6e1b2fa9eb3a0c67cd' 
  AND token = '58b+L3pS56EB49zrVKAdYIxAQsPFSS4fkpP9+6bNxg0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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