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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f834ae7adba40484d07d7ea0b936b7cde334e0e22c6916d6ce7cf26f767dc691' 
  AND token = 'W11uzUmPlhIH9GEyk02lrbGS5K5YWGvTMCh4KdvuaDQ=' 
  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"
    }
  }
}