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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd36c61b8f54c6c059f3ec7e492e811b334931aea2cbe432192e420965d90d2b6' 
  AND token = '/ZbF8aXcaPLFg+kh5zYOiApXMAgMtUX+kwSQhrP0xNQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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