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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '10cb0c5d39919a1f61b68cb48be92e027aef79569c702b7b26162e3abebe2843' 
  AND token = '+COUe9m6Gvxz9zc4moYUyBmsKvSWmbS0yntlaPWU3Rw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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