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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2e56d5c86ce26f6e600e33a9200cf3e8e3edaa9a51f794da5f1b87efb43061fb' 
  AND token = 'PvUsDykfZE4x6w53zafzUz0R3gohY7qReiVEARy/0Fc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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