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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a70fdf5d6c507336a11030d25a20d83ecbae5c046bbe04b1e5820ace80430ab8' 
  AND token = '/CtCIb1bdRxxznN4EPAdNW7WZecDJgskyV9i6AS+4QA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00051

JSON explain

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