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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fd5c1e264506cf45c6cd17eb367d7ca792ca062a5e5447b79f303fb04a2aa7d5' 
  AND token = 'pKw52Lchx9DcVM5+5MrFfG5MDxvooDKqRlxi59g6fw8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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