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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '609c1e3d0e789a72941d5ee8ea18d429efb6689710d131c2ce8bc726a910acff' 
  AND token = 'w+0LwLzB3CVn9W3ggBj86O3mwvKvvmRl6cWe48POM9w=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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