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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c72aff62a073b7ad99b7bb10671516542f65a181240e540d07a1d1799ca0ae9f' 
  AND token = '167ug2g8dh2SxYfQaXr/aO4zBT2M+ko18rcLCHJcnd0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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