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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b9a110014df1d09c19680b201f15d69e924abe8874980d8542e6ee6e5a6827b0' 
  AND token = 'ZDpCgZ1vgWW7P4shIWBM6QyfjaTUUsqFeTFRO1F/j8c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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