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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ed568568b72c9532c5573dbbe19aaa8b0c9319da4634a365776663612c2809bc' 
  AND token = 'dcP/LpPatsRsNy4cS1YuIJ0ClOE+muJko29F8gw9emE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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