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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'eb31438682720f3c06caaaabdbe50ad0e8822354a622f65a8cf34ddc8b30e62c' 
  AND token = 'mVIEuklvU8XfNqkx5xN9fM8j4v2ooYQu4ubrGQVMnuE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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