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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c0afa95900b77ceca7da9d40a1285120b9a8d7fb9193d4d219c72abe536337d2' 
  AND token = 'P3BARxJOgbDF6oKntv9QMjb2MSCBAo1h8zd3t7ujl90=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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