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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c3079d045fa3a4092bcc2a6f37f086df5234d10f2b295150a63b2c45303609e3' 
  AND token = '4HclAFn/lLcgaZSYOv+gPVYyEFiQoAlw5bMsQVqII+Y=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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