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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b27d855f9ee76a2a96982553e056273251be9b65869e6664c7d0d64c686cf16d' 
  AND token = 'ie42+trFd07K9LbawSA+lhV9c5EFyk6MIn7byz/PnRU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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