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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e1b9f90928ef776cf3c23c0aab5b67b89745fe5518252c0b747c881c9b917d29' 
  AND token = '/j9DqvrLIrt9KkO1bYf/CUQmO27cwV7YLrnsekdGUos=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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