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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '339d30abff83d1d99368cfbd8b76f0c6e16f44d6abb7158b17f6b47c4b2c360c' 
  AND token = 'TT8BgKAZPMCreg4d3nRM7v3AMs5GUPoPNzoAFWEjcd4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00051

JSON explain

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