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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'dd607898b96ce62d6d5238fad497964ff90970b519f704e59ef51d7781b67811' 
  AND token = 'yxO77XDb+bj5LkAfujpw7C1HiWyLt9g7sAn/AvkRSmY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00011

JSON explain

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