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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '20c3cc79af67d4d9850f1643da8f7dcdaf5d4cc7fddc730a2c7a1e41aecc42dd' 
  AND token = 'j9JSdYlVyQPenk9ft97ngv/5lKI8Yjetudk/kaXkVCo=' 
  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"
    }
  }
}