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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c874dc82a8c976360c63fe5f4e8a26103031125333ab1700ad7eee2cc6824eba' 
  AND token = '3DwXxBwIuAbACyvQUpfWuX5eiCivM5NevxUmJ3o5IQM=' 
  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"
    }
  }
}