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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a742ac29a0bd5427a3a5ec0787b9525da17c8218603c9c9b1af82269e83329cf' 
  AND token = 'ye0dnKdYtPOsUQvrW2H6rpDReil7XROghZXU4b77vEo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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