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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0721194d61df91813312d1afcfc2cd5752c75ae4a76b7d55d8cf1a3f96f7102d' 
  AND token = '56var1Tl94bdv9Y2K6ZDTMkWD/fCHK6M+/9d/rRqNlM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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