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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ab5623f582946f824bfb0e2791b687a8b09651c9f16b15d93ccaaecb3ed27776' 
  AND token = 'OtinxL79BsoZYO2i5RcKwZesqZDDr2yb1p3cuWyQ93I=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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