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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c6707494fa66f342f2d5dd67f9d7cae26a23b339523a751436275325b5a67617' 
  AND token = 'wz6dQ16aIGJVLYi7XpCoNQzBmahnBKju6NtbS7loSuU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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