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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5bf7b1a8457f25f5a184be190120bc9f89a65f9a8434d29682ae0cdf9a8ae458' 
  AND token = 'vs6BhMqcMuwk2yOY/jQNpBAuye8b1dRcJskNDi2Qf0k=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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